package com.example.util;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.JwtBuilder;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import lombok.Getter;
import lombok.Setter;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

import java.util.Date;
import java.util.Map;

@Getter
@Setter
@Component
@ConfigurationProperties("jwt.config")
public class JwtUtils {

    //签名私钥
    private String key;
    //签名的失效时间
    private Long ttl;

    /**
     *设置认证token
     *
     * @param map
     * @return
     */
    public String createJwt(Map<String,Object> map){
        //1.设置失效时间
        long now = System.currentTimeMillis();//当前毫秒
        long exp = now + ttl;
        //2.创建jwtBuilder
        JwtBuilder jwtBuilder = Jwts.builder()
                .setIssuedAt(new Date())
                .signWith(SignatureAlgorithm.HS256,key);
        //3.根据map设置claims
        for(Map.Entry<String,Object> entry : map.entrySet()) {
            jwtBuilder.claim(entry.getKey(),entry.getValue());
        }
        jwtBuilder.setExpiration(new Date(exp));
        //4.创建token
        String token = jwtBuilder.compact();
        return token;
    }

    /**
     * 解析token字符串获取clamis
     */
    public Claims parseJwt(String token){
        if(token==null){
            return null;
        }
//        token = token.replace("Bearer", "");
        Claims claims = Jwts.parser().setSigningKey(key).parseClaimsJws(token).getBody();
        return claims;
    }

}
